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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending $ 258 $ 241
Total gross secured borrowings 258 241
Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 245 239
Equity Securities [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 2 1
Foreign Government Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 11 1
Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 258 241
Overnight and Continuous [Member] | Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 245 239
Overnight and Continuous [Member] | Equity Securities [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 2 1
Overnight and Continuous [Member] | Foreign Government Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings $ 11 $ 1